Guardian Angel or Ghost Picture?

This picture was at the scene of a horrible accident very shortly after the crash. Some say that this is an angel. The woman involved in the accident firmly believes that this is an image of her guardian angel. From the looks of the wreckage, an angel would have definitely been needed. It is also important to note that the angelic figure also appears on the negative of the picture, making things a little more difficult to explain. What do you think? Guardian Angel Picture? Or nothing at all?